Not sure about the entire flat/shadow style, but these 36 travel and vacation icons (AI, EPS, PSD) are nice indeed. http://ift.tt/1DSglaJ
Freebie: Travel and Vacation Icon Set | Codrops
A set of 36 colorful and versatile travel and vacation related icons. The icons have a flat design with a long shadow and they come in several vector formats.
more @ http://ift.tt/1GrinEG